In the ingredient descriptions: Good means that I like to see this in a product's list of ingredients. Okay means this product appears safe for a curly person like me to use. Caution means that this ingredient may not be good in some hair care products, or for some people. Avoid means this ingredient may hurt your hair. If you see this ingredient in a hair product, it's best to put it down and walk away.

Trisodium Ethylenediamine Tetraacetate(aka Trisodium EDTA)Avoid
Used as a preservative (an antioxidant) and as a chelating ingredient, often found in conditioners and a wide range of cosmetic products. Slightly more irritating and corrosive to skin than Disodium EDTA, but because it has more of a strongly basic pH, this is what makes it harsher. Synthetic. Sold as a white powder that dissolves easily in water. Similar to Tetrasodium EDTA.
See also:Chelating agentPreservativeDisodium EDTATetrasodium EDTASource(s): HuntingGottschalck